G26137G26161 G26196
Flap Transmission Installation  500 
27-51-281  Figure 401 (Sheet 1)  Aug 15/77 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

500  Flap Transmission Installation 
Jun 20/84  Figure 401 (Sheet 2)  27-51-281 
Page 403 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Flap Jackscrew Installation  500 
27-51-281  Figure 402  Aug 15/73 
Page 404 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

3.  Remove Flap Transmission
A.  Disconnect transmission jackscrew from gimbal by removing four bolts through gimbal and removing upper and lower bushings from ball nut trunnion (Fig. 402). At outboard flap transmissions, note location of shims to ensure proper replacement.
B.  Remove screws attaching torque tube coupling sleeves to splines to disconnect torque tubes (Fig. 401).
C.  Remove bolts attaching transmission to flap track and remove transmission from airplane.
D.  If required, disconnect ball nut and screw assembly from transmission by removing two bolts at universal joint yoke.
4.  Prepare Flap Transmission for Installation
A.  If ball nut and screw assembly is not installed on transmission gearbox, position screw in transmission universal joint. Coat both faying surfaces with BMS 5-95 sealant before assembly. Install bolts to connect screw to yoke and tighten bolts per Fig. 401. Apply sealant to the bolts, washers and nuts.
B.  Position flap transmission in horizontal position and fill to level of filler port with hydraulic fluid. Rotate input drive by hand and add fluid as required. Continue until fluid level stabilizes and remains in filler port.
C.  Rotate ball nut until upstop on ball nut contacts upstop on screw yoke. Check that a gap of
0.064 +0.035 inch exists between end of upstop on ball bearing nut and adjacent face of yoke (Fig. 401, 402 and 403).
5.  Install Flap Transmission
A.  Locate gearbox on flap track and install mounting bolts (Fig. 401).
(1)  
On inboard flap transmission assemblies, tighten bolts per Fig. 401.

(a)  Apply the BMS 5-95 sealant to the heads of the bolts.

(2)  
On outboard flap transmission assemblies, apply MIL-C-11796 class 3 corrosion preventive compound to the bolts and to all areas of the hole. Tighten nuts and bolts per Fig. 401. If required, place washers under heads of aft mounting bolts to obtain bolt end protrusion per Fig. 401. Ensure that jackscrew is inserted in gimbal and that gimbal yoke is properly oriented with tang forward.

CAUTION:  MAKE SURE THE ENDS OF THE BOLTS DO NOT TOUCH THE TRANSMISSION HOUSING. THE BOLTS CAN CAUSE DAMAGE TO THE TRANSMISSION.
NOTE:  If transmission assembly does not clear bus cable pulleys because of heavier housing, clean and dress housing case 0.10 maximum to clear pulleys.
(a)  Apply the BMS 5-95 sealant to the heads of the bolts.
500 
May 01/01  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-51-281 Page 405 

B.  Install alemite fitting on oil can and completely fill ball nut reservoir through lower fitting with lubricating oil. Simultaneously, depress upper fitting to vent pressure until lubricant flows out of upper fitting. When lubricant exits upper fitting, close fitting and continue to fill until lubricant exits from wiper seals or vent hole.
C.  Rotate ball nut on jackscrew until trunnion on nut is aligned with gimbal (Fig. 402).
D.  Position ball nut and screw in gimbal.
(1)  
If installing inboard flap outboard transmission, position ball nut so that ball return tubes are on the outboard side of nut.

(2)  
If installing inboard flap inboard transmission, position ball nut so that ball return tubes are on the inboard side of nut.

NOTE:  If installing outboard flap transmission, direction of ball return tubes is optional.
E.  Install upper and lower bushings on ball nut trunnion. Coat outer surface of bushings with BMS 5-95 sealant before installation. If used bushings are being installed, check for allowable wear.
(1)  If installing outboard flap transmission, ensure that shims are installed in position noted during removal.
NOTE:  Support flap when removing or installing bushings or shims to keep weight of flap off trunnion.
F.  Install four bolts to secure bushings in gimbal.
(1)  Apply MIL-C-11796, Class 3 corrosion preventive compound to the bolts.
G.  Temporarily install screws connecting torque tubes to transmission assembly (Fig. 401).
　
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